I have created a university based group on Facebook which enables me and my colleagues to help each other in university.

To make the group efficient and easy to use (by me and my colleagues) I want to divide the group into sections which represent the different university subjects (like mathematics, chemistry, physics etc.) and to make posts and upload pictures, videos and documents (Word, Excel, PowerPoint, OneNote & Access) for every section (or in my case for every university subject separately).

However, there is a similar way you can do this. Try Google+, it actually has a great way to do groups--where every post is categorized into sections. I believe there might also be Google Drive implementation for uploading attachments and what not, but I'm not as confident for that aspect. In the least you could upload it to Google Drive then give them the sharable link of course